Dividers and adjustable point therefor



Jan. 19, 1932. A. RENZELBERG 1,842,051

DIVI DERS AND ADJUSTABLE POINT THEREFOR File d March 12, 1929 lnvenl'or:

Patented Jan. 19, 1932 UNITED STATES AUGUST RENZE'LBERG, F NUREMBERG,GERMANY DIVIDERS AND ADJUSTABLE POINT THEREFOR Application filed. March12, 1829, Serial No. 346,408, and in Germany May 4, 19 28.

This invention relates to dividers and more particularly to dividerscomprising an adjustable point for one of the legs thereof. In a knownconstruction of this kind there is provided a fixed center of rotationon the leg of the divider, said fixed center of rotation serving as anaxle around which the adjustable point may be swung, while the point isprovided with a resilient extension and a pressure screw below saidextension.

The dividers according to my present invention, in contra-distinction toknown constructions, comprise a point in the form of a shank which atits rear end is provided with a stop, support or the like engaging withan abutment located within a groove in the leg of the dividers.According to my invention, furthermore, said rear end of the shank is ofbow-shaped conformation and 0 is engaged at a place about at its centerby the head of a threaded spindle.

By my invention on the one hand the advantage is secured that themanufacture of the adjustable point for the dividers will be greatlysimplified on account of the fact that a fixed center 01": rotationwhich ordinarily serves for the adjustment of the point will bedispensed with. In addition to this, there will be the advantage thatthe adjusting screw for the point of the dividers will solely be exposedto tensional strains, this resulting in the possibility of attaining afiner adjustment that had heretofore been possible when employing anadjusting device in the form of a pressure screw as had been usual inconnection with adjustable points for dividers.

According to my invention the adjustable point of the dividers is fixedupon the respective leg of the dividers solely by inserting said pointinto said leg and by providing a stop or abutment adapted to properlysupport the adjustable point at or near its rear end within said leg. Byso constructing the adjustable point of the dividers, said adjust-- ablepoint may easily be mounted within and removed from said dividerswithout it being necessary to send the latter to the factory for repair.

0 The accompanying drawings represent an embodiment of my invention,Fig. 1 being a Figs. 1 and 2.

Referring now more particularly to the drawings, the leg 1 of thedividers is adapted to receive a shank in the form or" an adjustable andexchangeable point by means of a groove 2 which is milled into said leg1 in iongitudinal direction thereof. A stop or abutnent 3 in the form ofa pin or the like passes transversely through said groove 2. The upperpart of the adjusting point consists of a resilient curved extension 6which at its free end is provided with a recess 7 abutting against saidpin 8, while the lower part of said adjustable point projectslongitudinally from said leg and forms the point proper thereof. Moreparticularly, the resilient curved extension 6 in normal condition isbent towards the inside of the dividers, while the back 9 of saidresilient bow-shaped extension 6 is flat permitting proper resiliencythereof. Intermediate the extension 6 and the member 5 which is ofcylindrical crosssection there is provided a threaded spindle as shown,for instance, in Fig. d of the drawings. In order to fix the threadedspindle at a proper place within the leg 1 of thedividers and in orderto prevent the resilient curved extension 6 of the adjustable pointagainst slipping outin the groove 2 of said leg 1, there is providednear the seat for the adjusting nut on the threaded spindle a smallrecess which constitutes an upper and under stop for the head of thethreaded spindle, as I may be seen from Fig. 1.

The adjustable and exchangeable point of the dividers which is composedof the point proper 4 and the resilient curved rear extension 6 isinserted into the "roove 2 of the le 1 z a: j

of the dividers in such a manner that the recess 7 provided at the rearend of said extension 6 will engage with the pin or abutment 3, whilethe threaded spindle which serves for the adjustment of said point 4passes towards the outside through a bore at the b0ttom of said groove.The adjusting nut as indicated in the drawings is threaded upon saidspindle and engages with the outer surface of the leg 1 of the dividers.

Upon actuating the adjusting device by drawing tight the adjustingscrew, the resilient extension 6 by reason of its bow-shapedconformation and its resiliency now will cause the point 4 to move ininward direction of the dividers. In this manner the point 4 may followthe motion of said adjusting nut, thus securing the desired fineadjustment with respect to the fixed point of the other leg of thedividers.

In general, therefore, my invention provides an adjustable point fordividers, said point being fixed on one of the legs thereof solely byinsertion thereinto in longitudinal direction, while an abutment or stopserves as a proper rear support for said point which may be adjusted bya nut with respect to the fixed point of the other leg of the dividers.In addition to this, the adjustable point according to my presentinvention may easily be mounted upon and removed from the respective legof the dividers and readily exchanged if required.

I claim:

1. In dividers, the combination of a pair of legs, there being a grooveprovided longitudinally in one of said legs adjacent its end, anadjustable point having a rearward curved resilient extension adapted tobe inserted into said groove, there being a recess at or near the freeend of said resilient curved extension, an abutmentin said grooveadapted to engage in said recess, and an adjusting device permitting tochange the curvature of said extension, thus to adjust said point withrespect to said one leg, said adjusting device comprising a threadedspindle having a head engaging said resilient extension and an adjustingnut engaging said leg.

2. Dividers specified by claim 1, in which the adjusting nut is adaptedto move said point away from the point of the other leg when drawingtight said adjusting nut.

In testimony whereof I afiix my signature.

AUGUST RENZELBERG.

